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Weedy sea dragons can reach 45 cm in length. They feed on tiny crustaceans and other zooplankton, which they suck into the end of their long tube-like nose. They don't have a tail that can wrap around and hold on to things the way a seahorse can. They swim in shallow reefs and weed beds, and look like weeds drifting over bare sand.[2]

Sea dragons, seahorses and pipe fish are the only species where the male carries the eggs. The male carries the fertilized eggs, joined under his tail. They stay there for about eight weeks until they hatch. The young can look after themselves as soon as they are born.[2] Breeding sea dragons in captivity is rare because scientists don't know what makes them breed in the wild. Keeping sea dragons in captivity is difficult as only about 60% will survive.[3]